The bargaining power of ผู้จัดส่งวัตถุดิบ is also described as the market of inputs. ผู้จัดส่งวัตถุดิบ of raw materials, components, labor, and services (such as expertise) to the firm can be a source of power over the firm, when there are few substitutes. ผู้จัดส่งวัตถุดิบ may refuse to work with the firm,or, e.g., charge excessively high prices for unique resources.